Scope pics...

[Matt S Bower]

Bruce Plecan wrote:
> 
> How about Edison /Tesla?.
> Then again with an autotransformer things even blur more,  what at a glance
> looks like something is something else.
> Bruce
> 
> > I would like to know where I can buy this magic coil (transformer) that
> when
> > you put DC on the primary you get stepped up DC on the secondary.
> > Furthermore this magic   DC coil running at 8000 RPM has a DC FREQUENCY of
> > 532 HZ to Drive a DC tachometer indicating DC Revolutions per minute.
> > It seems like we are having the Edison / Westinghouse war of the currents
> > all over again


All of this talk about currents when the discussion is of a voltage wave
form and not of a current wave form which is considerably different. 
Remember that a coil is an inductor and that the response of an inductor
is to oppose the change in current through the inductor so that when the
points are closed the current flows through the inductor creating the
magnetic field of stored energy,  when the points open the inductor
reverses it's voltage and amplifies it's voltage in an attempt to keep
the current flowing in the same direction and at the same rate until the
energy in the magnetic field is used up.  This inverted spike is
precisely what is used in the ingnition coil although further amplified
by the step up to the secondary coil.  These segments of the points
being on or off and the different parts of the reaction are all A/C
components that have frequency that readable by a tach, but the actual
spark across the gap of the plug will work in the same direction each
and every time.  Thus the current through the spark plug, which is only
during spark, is always going in the same direction.
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